Technology of Sound Intensity Theory in High Speed Railway Car Noise Controlling

Advantage of high speed railway has been approbated in the world. But railway noise is more and more serious. The higher speed of railway car, the bigger value of noise then its harm is more evident. The noise that passes to railway car body interior can considerably reduce ride comfort; the noise passes to railway car body exterior will be made the area along railway, which strictly demands to noise suffer heavily. Noise abatement and reduction has become one of the major research questions on the railway car design, manufacturing department and environmental protection. The paper analyzes types of high speed railway car noise source and producing mechanism, tests railway car body interior noise applying sound intensity theory, and researches its propagation path and distribution property deeply. It puts forward that aerodynamic noise has larger influence relative to wheel-rail noise along with the increase of running speed. The conclusions provide a reference for studying on railway car noise controlling.